Cobbled Together. Leitz Summicron 50mm DR

Some weeks back, a little Japanese laminated steel plane blade, long-buried in a box, appeared.  After some thought, I decided to turn it into a marking knife.  Some further searching brought to light a small piece of Macassar Ebony, some thin strips of copper, and tiny machine screws, all relics from my harpsichord-making period.  Some sawing, drilling and filing produced a useful tool.